I have always wondered about the factual basis to the claim that Rugers need to be thicker than S&Ws due to investment cast parts.
The Ruger Six series, and the Smith K frames, are very close in size and weight. They both fit in the same holsters, and except with wadcutters, can use the same speed loaders. So the additional bulk has to be, at the most, very minimal. One of my PPC revolvers is built up on a Ruger Police Service Six. That is a fixed sight revolver, so the top strap appears, without measuring, to be the same or closely similar to the fixed sight Smith K frame top strap. I have seen it written that the heavier top strap on the adjustable sight Rugers is to allow for the placement/protection of the adjustable rear sight assembly.
So, given the above, I would expect the Ruger Six series to be as robust as the K frame, but no more than that given the size/weight similarity. But history has proven the Ruger Six series to be far more robust than the K frames, not just equal.
I have seen this issue discussed countless times, but this apparent contradiction has never been addressed.
If anyone has some specific documented factual information, other than opinion or hearsay, I would be most interested.
I don't have a dog in this fight. I own both Smiths and Rugers. In my opinion, but often debated, the Smith L frame is an ideal revolver. I consider it to be the best .357 Smith has ever manufactured. It is my favorite Smith.